US20060044710A1 - Ground fault detector for generator feeder - Google Patents
Ground fault detector for generator feeder Download PDFInfo
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- US20060044710A1 US20060044710A1 US10/925,056 US92505604A US2006044710A1 US 20060044710 A1 US20060044710 A1 US 20060044710A1 US 92505604 A US92505604 A US 92505604A US 2006044710 A1 US2006044710 A1 US 2006044710A1
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- Prior art keywords
- generator
- feeder
- ground fault
- fault detector
- current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
- H02H3/162—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for ac systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
Definitions
- the present invention relates to aircraft generator feeders, and more particularly to a circuit that detects a ground fault in an aircraft generator feeder.
- Generator feeders are commonly used in aircraft electric power generating systems to supply power to the aircraft.
- Generator feeders link a generator with an aircraft power panel to supply current to the power panel.
- the generator feeder may experience a ground fault if, for example, there is a break in wire insulation or a faulty connector. The ground fault will cause current to leak from the generator feeder to other areas in the aircraft.
- Differential protection circuits are normally used to detect these faults by measuring the difference between the current supplied by the generator and the current consumed by the aircraft system through the power panel.
- the differential protection circuit de-excites the generator and trips one or more generator circuit breakers in the power panel if it detects a fault current above a selected threshold, indicating that a large amount of current supplied by the generator is not arriving at the power panel.
- the fault current threshold for the differential protection circuit in this case is normally set to a moderately high level (e.g., around 30 A) because the aluminum in the airframe can easily conduct these amounts of current away from the fault without heating or any other adverse effects. Thus, it is not necessary to detect faults below this level.
- the highly conductive properties of aluminum causes fault currents to be immediately conducted away from the power panel to ground and create a high current differential easily detectable by the differential protection circuit.
- composite materials such as carbon graphite fiber
- composite materials tend to act as a resistive heating element rather than as a conductor.
- they are not as effective as aluminum airframes in grounding fault currents.
- fault currents as low as 5 A over a long period of time may cause structural degradation.
- Fault currents at this low level are particularly hard to detect because they are well below the current detection threshold of the differential protection circuit.
- Traditional differential protection circuits suffer from inaccuracies due to the inherent tolerances in current measurement devices and the independent measurement of the current leaving the generator and the current entering the power panel. Any current sensor employed in this case to detect a low level of fault current must also be able to detect the high fault currents (i.e., on the order of thousands of amperes) that occur if the feeder fault generates a short circuit condition.
- a sensor that can accurately measure small fault currents will have a differential protection threshold that is too low to handle high fault currents, while a sensor having a high differential protection threshold will not be able to measure small fault currents accurately.
- the composite airframe acts as a resistive load with no arcing characteristics that would be detectable using signal processing techniques.
- the present invention is directed to a generator feeder fault detection system that can detect even small fault currents accurately.
- the system includes a ground fault detection senor that monitors the sum of the currents leaving a generator to a power panel and returning from the power panel back to the generator. During normal operation, the sum of the currents in the ground fault detection current transformer equals zero. If there is a fault, however, the ground fault detection circuit will detect a current sum greater than zero.
- the current sensor in the ground fault detector can be selected to measure small amounts of current and does not need to have a high threshold, even for generators that output high levels of current.
- FIG. 1 is a representative diagram of a system containing generator feeders and a generator feeder fault detector according to one embodiment of the invention
- FIG. 2 is a representative diagram of a system with a generator feeder fault detector according to another embodiment of the invention.
- FIG. 3 is a representative diagram of a generator control unit having a generator feeder fault detector according to another embodiment of the invention.
- the invention is generally directed to a generator feeder system 100 having a fault detector that can detect even small fault currents in a generator feeder 102 accurately.
- a given system 100 may include a generator 106 and a power panel 108 linked by a plurality of feeders 102 .
- the generator 106 is a three-phase generator having a phase winding 110 associated with each phase.
- the feeders 102 may be single or parallel feeders that share the generator load.
- the generator neutral connection 112 is connected to a ground of the aircraft through a generator neutral connection relay (GNR) 114 in the power panel 108 .
- GNR generator neutral connection relay
- the generator neutral connection 112 carries any unbalanced load current back to the generator.
- Each phase winding 110 has an associated generator current transformer 111 for over-current protection of the generator 106 and the feeders 102 .
- a feeder fault will typically cause the generator 106 to feed more current than it should feed.
- the generator current transformers 111 cause the generator 106 to shut off if the fault continues for an extended time period.
- the power panel 108 may also include parallel feeder current transformers (PFCT) 116 .
- the PFCTs 116 measure the current in each feeder 102 to ensure that the current is at a level that does not indicate an open feeder 102 .
- each phase winding 110 in the generator 106 has two associated PFCTs 116 .
- the difference between the current in the generator current transformers 111 and the sum of the current in the PFCTs 116 for that phase is the current differential normally used to detect feeder faults.
- the generator current transformers 111 and the PFCTs 116 in combination are used for differential protection.
- a ground fault detector 120 such as a ground fault detection current transformer, in the power panel 108 .
- the generator neutral connection 112 and the GNR 114 make using the ground fault detector 120 possible because the grounding for the system 100 centralizes the ground of the system 100 to a specific location that can include the feeders 102 and the generator neutral connection 112 in the ground fault detector 120 .
- the ground fault detector 120 monitors the sum of the currents on the feeders 102 and the generator neutral connection 112 .
- the forward and return currents on the feeders 102 travel in opposite directions, and therefore the sum of the forward and return currents traveling through the ground fault detector 120 will equal zero if there are no faults causing current leakage in any of the feeders 102 . If there is a feeder fault, however, the sum of the currents through the ground fault detector 120 will be non-zero because current leakage will cause the forward and return currents to be unequal.
- the ground fault detector 120 monitors the sum of the currents in the system 100 rather than the absolute value of the individual currents, it can detect very small fault currents while still allowing high currents to flow normally. Even a tiny fault in the feeder 102 will be detectable by the ground fault detector 120 because the current sum will normally be zero and therefore any non-zero sum in the ground fault detector 120 will be registered as a fault. Thus, the ground fault detector 120 does not need to have a high threshold, even for generators 106 that output high levels of current. Instead, the components in the ground fault detector 120 can be designed to measure small amounts of current. If a ground fault occurs, the resulting current difference de-excites the generator 106 and trips a generator circuit breaker 122 to stop current flow in the feeders 102 .
- Hall Effect sensors 124 may also be included in the power panel 108 .
- the Hall Effect sensors 124 are able to sense both DC and AC current in the feeders 102 .
- the Hall effect sensors 124 act as a supplemental protection device to handle faults causing high DC currents to pass through the feeders 102 .
- faults that cause over-currents with significant DC content e.g., rectified load faults
- will saturate the PFCTs 116 which are AC devices, and cause them to stop working. When they are saturated, however, they will indicate that there is no current passing through even though DC current is passing through both the PFCTs 116 and the generator current transformers 111 .
- the current differential between the PFCTs 116 , the generator current transformers 111 , and the ground fault detector 120 will not indicate the presence of a fault.
- the Hall Effect sensors 124 are used to ensure that DC load faults will still be detectable.
- a generator circuit breaker 122 is tripped by either the Hall Effect sensor 124 or the ground fault detector 120 to stop current flow in the feeders 102 if a fault is detected.
- the generator current transformers 111 may be eliminated from this embodiment without any adverse effect.
- the generator current transformers 111 are also used to limit generator power in load faults, such as line-to-line faults between the feeders 102 , which result in severe current imbalances between pairs of PFCTs 116 in a given phase ( FIG. 1 ).
- the PFCTs 116 can serve the power limiting function instead because the generator feeders 102 are protected by the ground fault detector 120 . This greatly reduces the number of components and wires in the system 100 .
- FIG. 2 illustrates another embodiment of the inventive system 100 .
- This embodiment does not have any generator current transformers 111 or PFCTs 116 because the ground fault detector 120 can detect all probable feeder faults.
- the Hall Effect sensors 124 are still incorporated in this embodiment to detect and protect against both overcurrent faults and DC load faults.
- each phase has two Hall Effect sensors 124 to conduct open feeder protection in addition to overcurrent and DC load fault protection.
- the Hall Effect sensors 124 in essence replace the PFCTs 116 shown in the previous embodiment.
- the ground fault detector 120 de-excites the generator 106 and trips the generator circuit breaker 122 as there is a significant difference in the current on the feeders 102 . Incorporating the ground fault detector 120 into the system 100 therefore allows the generator current transformers to be eliminated from the generator 106 and the PFCTs 116 to be eliminated from the system 100 because differential current detection is no longer an issue.
- the embodiment shown in FIG. 2 provides fault detection without requiring any current transformers other than the one, if used, for the ground fault detector 120 .
- the system 100 shown in FIGS. 1 and 2 may be used in a generator control unit 130 , as shown in FIG. 3 , having a control processor 132 that processes the non-zero fault current signal detected by the ground fault detector 120 to identify and protect against intermittent faults to ground by detecting the signature of an arc in the measured ground fault current.
- the location of the ground fault detector 120 ensures that it will always see the true power level of the generator 106 and will not be affected by unbalanced loads or non-linear loads in the aircraft.
- the generator 106 is also used as a motor to start an aircraft engine (not shown).
- the starter mode the generator is used as a three-phase motor.
- the generator neutral connection 112 is disconnected by opening the GNR 114
- the operation of the GNR 114 may be controlled by the generator control unit in coordination with the engine start electrical power source.
- a built-in-test may be conducted by connecting a small known load in the power panel 108 to appear as a differential fault. The fixed error induced by this load will be ignored by the ground fault protection circuit in the ground control unit. However, if the error goes to zero then it can be assumed that the ground fault detector has failed.
- ground fault detector in an aircraft as a feeder fault detector therefore allows easy detection of even small feeder faults by acting as one large central current transformer connected to the feeders and the neutral line. Under all normal operating conditions, the sum of the currents through the ground fault detector will be zero; thus, any non-zero current sum will indicate a fault.
- the ground fault detector also simplifies DC current fault protection by eliminating the need for coordination between DC fault detectors (e.g., Hall effect sensors) and any differential protection circuitry, such as generator current transformers and PFCTs. Moreover, as shown in FIG. 2 , the number of components in the overall system may be reduced because PFCTs can be replaced completely with Hall Effect sensors.
Abstract
A generator feeder fault detection system includes a ground fault detector transformer that monitors the sum of forward and return currents from and to a generator. During normal operation, the sum of the currents in the ground fault detector equals zero. If there is a fault, however, the ground fault detector will detect a non-zero current sum. Because the ground fault detector measures the sum of the currents traveling through it, the current sensor in the detection circuit can be selected to measure small amounts of current and does not need to have a high threshold, even for generators that output high levels of current.
Description
- The present invention relates to aircraft generator feeders, and more particularly to a circuit that detects a ground fault in an aircraft generator feeder.
- Generator feeders are commonly used in aircraft electric power generating systems to supply power to the aircraft. Generator feeders link a generator with an aircraft power panel to supply current to the power panel. The generator feeder may experience a ground fault if, for example, there is a break in wire insulation or a faulty connector. The ground fault will cause current to leak from the generator feeder to other areas in the aircraft.
- Differential protection circuits are normally used to detect these faults by measuring the difference between the current supplied by the generator and the current consumed by the aircraft system through the power panel. The differential protection circuit de-excites the generator and trips one or more generator circuit breakers in the power panel if it detects a fault current above a selected threshold, indicating that a large amount of current supplied by the generator is not arriving at the power panel.
- Because airframes in the aircraft are commonly manufactured from aluminum, which is highly conductive, fault currents leaking from the generator feeders will immediately travel through the aircraft. The airframe therefore acts as an effective ground for the fault current. The fault current threshold for the differential protection circuit in this case is normally set to a moderately high level (e.g., around 30 A) because the aluminum in the airframe can easily conduct these amounts of current away from the fault without heating or any other adverse effects. Thus, it is not necessary to detect faults below this level. Moreover, the highly conductive properties of aluminum causes fault currents to be immediately conducted away from the power panel to ground and create a high current differential easily detectable by the differential protection circuit.
- In more recent airframe structures, composite materials, such as carbon graphite fiber, are becoming increasingly common. Unlike aluminum, composite materials tend to act as a resistive heating element rather than as a conductor. As a result, they are not as effective as aluminum airframes in grounding fault currents. For some composites, fault currents as low as 5 A over a long period of time may cause structural degradation. Thus, it is desirable to detect even small fault currents to ensure optimum airframe conditions.
- Fault currents at this low level, however, are particularly hard to detect because they are well below the current detection threshold of the differential protection circuit. Traditional differential protection circuits suffer from inaccuracies due to the inherent tolerances in current measurement devices and the independent measurement of the current leaving the generator and the current entering the power panel. Any current sensor employed in this case to detect a low level of fault current must also be able to detect the high fault currents (i.e., on the order of thousands of amperes) that occur if the feeder fault generates a short circuit condition. However, current sensors are designed for optimum measurement in a limited range; thus, for example, a sensor that can accurately measure small fault currents will have a differential protection threshold that is too low to handle high fault currents, while a sensor having a high differential protection threshold will not be able to measure small fault currents accurately. Also, the composite airframe acts as a resistive load with no arcing characteristics that would be detectable using signal processing techniques.
- There is a desire for a generator feeder fault detector that can reliably detect small fault currents so that it can be used in an aircraft having a composite airframe.
- The present invention is directed to a generator feeder fault detection system that can detect even small fault currents accurately. The system includes a ground fault detection senor that monitors the sum of the currents leaving a generator to a power panel and returning from the power panel back to the generator. During normal operation, the sum of the currents in the ground fault detection current transformer equals zero. If there is a fault, however, the ground fault detection circuit will detect a current sum greater than zero.
- Because the ground fault detector measures the sum of the currents traveling through it, the current sensor in the ground fault detector can be selected to measure small amounts of current and does not need to have a high threshold, even for generators that output high levels of current.
-
FIG. 1 is a representative diagram of a system containing generator feeders and a generator feeder fault detector according to one embodiment of the invention; -
FIG. 2 is a representative diagram of a system with a generator feeder fault detector according to another embodiment of the invention; and -
FIG. 3 is a representative diagram of a generator control unit having a generator feeder fault detector according to another embodiment of the invention. - The invention is generally directed to a
generator feeder system 100 having a fault detector that can detect even small fault currents in agenerator feeder 102 accurately. As shown inFIGS. 1 and 2 , a givensystem 100 may include agenerator 106 and apower panel 108 linked by a plurality offeeders 102. In the illustrated embodiment, thegenerator 106 is a three-phase generator having a phase winding 110 associated with each phase. Thefeeders 102 may be single or parallel feeders that share the generator load. The generatorneutral connection 112 is connected to a ground of the aircraft through a generator neutral connection relay (GNR) 114 in thepower panel 108. The generatorneutral connection 112 carries any unbalanced load current back to the generator. - Each phase winding 110 has an associated
generator current transformer 111 for over-current protection of thegenerator 106 and thefeeders 102. As is known in the art, a feeder fault will typically cause thegenerator 106 to feed more current than it should feed. Thegenerator current transformers 111 cause thegenerator 106 to shut off if the fault continues for an extended time period. - The
power panel 108 may also include parallel feeder current transformers (PFCT) 116. ThePFCTs 116 measure the current in eachfeeder 102 to ensure that the current is at a level that does not indicate anopen feeder 102. In the example shown inFIG. 1 , each phase winding 110 in thegenerator 106 has two associatedPFCTs 116. For each phase, the difference between the current in thegenerator current transformers 111 and the sum of the current in thePFCTs 116 for that phase is the current differential normally used to detect feeder faults. As a result, thegenerator current transformers 111 and thePFCTs 116 in combination are used for differential protection. - Fault detection is performed by a
ground fault detector 120, such as a ground fault detection current transformer, in thepower panel 108. The generatorneutral connection 112 and the GNR 114 make using theground fault detector 120 possible because the grounding for thesystem 100 centralizes the ground of thesystem 100 to a specific location that can include thefeeders 102 and the generatorneutral connection 112 in theground fault detector 120. - The
ground fault detector 120 monitors the sum of the currents on thefeeders 102 and the generatorneutral connection 112. The forward and return currents on thefeeders 102 travel in opposite directions, and therefore the sum of the forward and return currents traveling through theground fault detector 120 will equal zero if there are no faults causing current leakage in any of thefeeders 102. If there is a feeder fault, however, the sum of the currents through theground fault detector 120 will be non-zero because current leakage will cause the forward and return currents to be unequal. - Because the
ground fault detector 120 monitors the sum of the currents in thesystem 100 rather than the absolute value of the individual currents, it can detect very small fault currents while still allowing high currents to flow normally. Even a tiny fault in thefeeder 102 will be detectable by theground fault detector 120 because the current sum will normally be zero and therefore any non-zero sum in theground fault detector 120 will be registered as a fault. Thus, theground fault detector 120 does not need to have a high threshold, even forgenerators 106 that output high levels of current. Instead, the components in theground fault detector 120 can be designed to measure small amounts of current. If a ground fault occurs, the resulting current difference de-excites thegenerator 106 and trips agenerator circuit breaker 122 to stop current flow in thefeeders 102. -
Hall Effect sensors 124 may also be included in thepower panel 108. TheHall Effect sensors 124 are able to sense both DC and AC current in thefeeders 102. TheHall effect sensors 124 act as a supplemental protection device to handle faults causing high DC currents to pass through thefeeders 102. As is known in the art, faults that cause over-currents with significant DC content (e.g., rectified load faults) will saturate thePFCTs 116, which are AC devices, and cause them to stop working. When they are saturated, however, they will indicate that there is no current passing through even though DC current is passing through both thePFCTs 116 and the generatorcurrent transformers 111. As a result, the current differential between thePFCTs 116, the generatorcurrent transformers 111, and theground fault detector 120 will not indicate the presence of a fault. TheHall Effect sensors 124 are used to ensure that DC load faults will still be detectable. - Regardless of the specific fault, a
generator circuit breaker 122 is tripped by either theHall Effect sensor 124 or theground fault detector 120 to stop current flow in thefeeders 102 if a fault is detected. - Note that the generator
current transformers 111 may be eliminated from this embodiment without any adverse effect. Traditionally, the generatorcurrent transformers 111 are also used to limit generator power in load faults, such as line-to-line faults between thefeeders 102, which result in severe current imbalances between pairs ofPFCTs 116 in a given phase (FIG. 1 ). ThePFCTs 116 can serve the power limiting function instead because thegenerator feeders 102 are protected by theground fault detector 120. This greatly reduces the number of components and wires in thesystem 100. -
FIG. 2 illustrates another embodiment of theinventive system 100. This embodiment does not have any generatorcurrent transformers 111 orPFCTs 116 because theground fault detector 120 can detect all probable feeder faults. TheHall Effect sensors 124 are still incorporated in this embodiment to detect and protect against both overcurrent faults and DC load faults. In this example, each phase has twoHall Effect sensors 124 to conduct open feeder protection in addition to overcurrent and DC load fault protection. TheHall Effect sensors 124 in essence replace thePFCTs 116 shown in the previous embodiment. - As explained above, the
ground fault detector 120 de-excites thegenerator 106 and trips thegenerator circuit breaker 122 as there is a significant difference in the current on thefeeders 102. Incorporating theground fault detector 120 into thesystem 100 therefore allows the generator current transformers to be eliminated from thegenerator 106 and thePFCTs 116 to be eliminated from thesystem 100 because differential current detection is no longer an issue. Thus, the embodiment shown inFIG. 2 provides fault detection without requiring any current transformers other than the one, if used, for theground fault detector 120. - The
system 100 shown inFIGS. 1 and 2 may be used in agenerator control unit 130, as shown inFIG. 3 , having acontrol processor 132 that processes the non-zero fault current signal detected by theground fault detector 120 to identify and protect against intermittent faults to ground by detecting the signature of an arc in the measured ground fault current. The location of theground fault detector 120 ensures that it will always see the true power level of thegenerator 106 and will not be affected by unbalanced loads or non-linear loads in the aircraft. - In one example, the
generator 106 is also used as a motor to start an aircraft engine (not shown). In the starter mode, the generator is used as a three-phase motor. In this mode the generatorneutral connection 112 is disconnected by opening theGNR 114 The operation of theGNR 114 may be controlled by the generator control unit in coordination with the engine start electrical power source. - To prevent undetected dormant faults caused by failure of the
ground fault detector 120 and/or thesystem 100 described above may require a built-in-test (BIT). The BIT may be conducted by connecting a small known load in thepower panel 108 to appear as a differential fault. The fixed error induced by this load will be ignored by the ground fault protection circuit in the ground control unit. However, if the error goes to zero then it can be assumed that the ground fault detector has failed. - Using a ground fault detector in an aircraft as a feeder fault detector therefore allows easy detection of even small feeder faults by acting as one large central current transformer connected to the feeders and the neutral line. Under all normal operating conditions, the sum of the currents through the ground fault detector will be zero; thus, any non-zero current sum will indicate a fault. The ground fault detector also simplifies DC current fault protection by eliminating the need for coordination between DC fault detectors (e.g., Hall effect sensors) and any differential protection circuitry, such as generator current transformers and PFCTs. Moreover, as shown in
FIG. 2 , the number of components in the overall system may be reduced because PFCTs can be replaced completely with Hall Effect sensors. - It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. It is intended that the following claims define the scope of the invention and that the method and apparatus within the scope of these claims and their equivalents be covered thereby.
Claims (13)
1. A generator feeder system, comprising:
a generator having a plurality of generator windings;
a generator neutral connection connected to at least one of said plurality of generating windings and to ground;
a power panel;
at least one feeder connected the generator and the power panel; and
a ground fault detector coupled to the generator neutral connection and said at least one feeder, wherein the ground fault detector indicates a fault if a sum of currents through said at least one feeder and the generator neutral connection is non-zero.
2. The generator feeder system of claim 1 , wherein said at least one feeder comprises a plurality of parallel feeders.
3. The generator feeder system of claim 1 , wherein said at least one feeder comprises a plurality of single feeders.
4. The generator feeder system of claim 3 , wherein each of said plurality of generator windings has two associated feeders.
5. The generator feeder system of claim 1 , further comprising a generator neutral relay connected between the generator neutral connection and ground.
6. The generator feeder system of claim 1 , further comprising at least one generator circuit breaker coupled to the ground fault detector, wherein the generator circuit breaker trips when the ground fault detector indicates a fault to stop current flow in said at least one feeder.
7. The generator system of claim 1 , further comprising at least one Hall Effect sensor disposed on said at least one feeder.
8. A generator feeder system, comprising:
a generator having a plurality of generator windings corresponding to a plurality of phases;
a generator neutral connection connected to at least one of said plurality of generating windings and to ground;
a power panel;
a plurality of feeders connected between the power panel and the generator, wherein each winding has two associated feeders connected to it;
a ground fault detector coupled to the generator neutral connection and said at least one feeder, wherein the ground fault detector indicates a fault if a sum of currents through said plurality of feeders and the generator neutral connection is non-zero; and
at least one generator circuit breaker coupled to the ground fault detector, wherein the generator circuit breaker trips when the ground fault detector indicates a fault to stop current flow in said at least one feeder.
9. The generator feeder system of claim 8 , further comprising a generator neutral relay connected between the generator neutral connection and ground.
10. The generator feeder system of claim 8 , further comprising at least one Hall Effect sensor disposed on said at least one feeder.
11. The generator feeder system of claim 8 , further comprising at least one feeder current transformer disposed on at least one of said plurality of feeders.
12. The generator feeder system of claim 8 , further comprising a generator control unit that processes the fault indication from the ground fault detector.
13. The generator feeder system of claim 8 , wherein the generator control unit processes the fault indication by detecting an arc signature to protect against intermittent faults.
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US10/925,056 US20060044710A1 (en) | 2004-08-24 | 2004-08-24 | Ground fault detector for generator feeder |
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US10505479B2 (en) | 2012-05-04 | 2019-12-10 | Siemens Aktiengesellschaft | Synchronous generator control, generator system and vessel energy system |
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US11268989B2 (en) | 2018-11-02 | 2022-03-08 | Hamilton Sundstrand Corporation | Dual feeder systems having current transformers |
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US20090096405A1 (en) * | 2007-10-15 | 2009-04-16 | General Electric Company | Method and system for remotely predicting the remaining life of an ac motor system |
RU2538183C2 (en) * | 2009-07-31 | 2015-01-10 | Эрбюс Операсьон | Aircraft with electrical equipment and part of composites |
CN102347610A (en) * | 2010-07-28 | 2012-02-08 | 空中客车营运有限公司 | Electrical power supply system for an aircraft |
DE102012201995A1 (en) * | 2012-02-10 | 2013-08-14 | Siemens Aktiengesellschaft | Switching device e.g. circuit breaker for protecting generator in wind power plant, has electronic shutter which is provided with direct current sensor provided with soft magnetic probes as magnetic field detectors |
US9407083B1 (en) * | 2012-04-26 | 2016-08-02 | The Boeing Company | Combined subtransient current suppression and overvoltage transient protection |
US10505479B2 (en) | 2012-05-04 | 2019-12-10 | Siemens Aktiengesellschaft | Synchronous generator control, generator system and vessel energy system |
US9136693B1 (en) * | 2013-02-26 | 2015-09-15 | Reliance Controls Corporation | Generator with selectively bonded neutral connection |
US9988139B2 (en) * | 2013-05-30 | 2018-06-05 | Eaton Intelligent Power Limited | Fault tolerant electronic control architecture for aircraft actuation system |
US20160068256A1 (en) * | 2013-05-30 | 2016-03-10 | Eaton Corporation | Fault tolerant electronic control architecture for aircraft actuation system |
CN103364665A (en) * | 2013-07-19 | 2013-10-23 | 国家电网公司 | Detection method for searching power grid side fault generator stator ground protection maloperation reason |
CN106249150A (en) * | 2016-09-26 | 2016-12-21 | 东南大学 | Detection method for the shorted-turn fault degree of five phase OW FTFSCW ipm motors |
CN108572329A (en) * | 2018-04-09 | 2018-09-25 | 陕西航空电气有限责任公司 | The current sampling device and fault judgment method of feeder line power-supply system in parallel |
US11268989B2 (en) | 2018-11-02 | 2022-03-08 | Hamilton Sundstrand Corporation | Dual feeder systems having current transformers |
EP3882643A1 (en) * | 2020-03-18 | 2021-09-22 | Hamilton Sundstrand Corporation | Arc zone fault detection |
US11300600B2 (en) | 2020-03-18 | 2022-04-12 | Hamilton Sundstrand Corporation | Arc zone fault detection |
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